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The effect of oxygen on transitional Marangoni flow in laser spot welding

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Zhao, C. X., Kwakernaak, C., Pan, Y., Richardson, I.M., Saldi, Z., Kenjeres, S. and Kleijn, C.R. (2010) The effect of oxygen on transitional Marangoni flow in laser spot welding. Acta Materialia, 58 (19). pp. 6345-6357. doi:10.1016/j.actamat.2010.07.056

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Official URL: http://dx.doi.org/10.1016/j.actamat.2010.07.056

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Abstract

Owing to its significant influence in heat and mass transfer, liquid metal flow during stationary laser welding has been studied for different concentrations of oxygen in the surrounding environment. Two predominant types of surface flow motion are observed: an inward flow, corresponding to a positive surface tension temperature gradient, and an outward flow, corresponding to a negative gradient. Time-dependent changes in oxygen concentration at the surface are observed to flip the surface tension temperature gradient from negative to positive under appropriate shielding conditions. The oxygen concentration affects not only the flow motion, but also the laser absorption coefficient, which increases with increasing environmental oxygen concentration. It is shown here that the evolution of dissolved oxygen in the weld pool as a function of temperature can have a profound influence on the fluid flow and hence on energy transport.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TS Manufactures
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Marangoni effect, Heat -- Transmission, Welded joints -- Thermomechanical properties, Laser welding
Journal or Publication Title: Acta Materialia
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 1359-6454
Official Date: November 2010
Dates:
DateEvent
November 2010Published
Volume: 58
Number: 19
Number of Pages: 12
Page Range: pp. 6345-6357
DOI: 10.1016/j.actamat.2010.07.056
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Netherlands Materials Innovation Institute
Grant number: MC8.05240

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